Precious stone



FIG. 1 is a perspective view of a precious stone showing my new design;

FIG. 2 is a top view thereof;

FIG. 3 is a bottom view thereof;

FIG. 4 is a front view thereof, the rear view being identical; and,

FIG. 5 is a right side view thereof, the left side view being identical. 

The ornamental design for a precious stone, as shown and described. 